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Patented Apr. 25, 1933 UNITED STATES- PATENT "OFFICE,

EDWARD T. HOWELL, OF MILWAUKEE, AND ROBERT J. GOODRICH, 01 SOUTH MIL- WAUKEE, WISCONSIN, ASSIGNOBS, BY MESNE ASSIGNMENTS, T E. I. DU PONT DE NEMOURS & COMPANY, A CORPORATION OI DELAWARE BLACK VAT DYESTUIT PREPARATION No Drawing.

' er rare and expensive. On the other hand,

there is a great -demand in the art for such dyestuffs and hence a real need for an economical manner of pre aring these products.

19 We have now foun that when the dyestufi known to the trade as Anthrene dark blue BO (Color Index No. 1099; dibenzanthrone) is mixed with a yellow or an orange vat dyestufi in certain proportions,

a mixture results with which cotton and other fibrous materials can be printed in blackshades. One of the yellow dyestuffs particularly suited for this purpose is Anthrene yellow G (Color Index No. 1118;

' flavanthrone). In view of the original colors of the components of such mixture, and the common knowledge that a mixture of blue and yellow-pigments produces a green, it was indeed unex cted that in this case the final color pro need by printing with our mixture should be black.

, It is accordingly an object of our invention to provide a simple, economical method of obtaining vat dyestufi preparations which rint in black or in'various color shades of lack.

It is a f urther important object of this invention to prepare such vat dyestufi's by mixing together known vat colors in certain proportions.

Other and. further important objects of this invention will become apparent from,

the following description and appended .lpplie'ationfiled may 21, 1930. Serial No. 454,500.

tures prepared produce on the fibre a black having a violet tinge, due to the predomi nance of the dark blue component; while. near the upper limit the dyestufi mixtures produce a greenish black. Over the major I0 portion of this range, however, the resulting composite mixture reduces fast, black prints on cotton and e like.

If desired, various pronounced shades may be given the above black dyestuff preparations by additions thereto of one or more components having a characteristic color.

For instance, the black color of said preparation will assume a greenish shade upon the addition or incorporation in the mixture of a green vat color such as Anthrenejade green (Color Index No. 1101; dimethoxy-dibenzanthrone). Of course, the depth of such greenish shade will vary, depending upon the amount of green dye employed.

The new products of this invention are particularly adapted for printing cotton and other fibrous materials. In such use their printing qualities may be improved by in- 79 corporating various assisting agents in the mixture; such as, for exam le, diethylene glycol and thio-diglycol as "sclosed in the co-pending application of Howell and Good- Serial No. 426,437, filed February 6,

The following examples in which parts by .weight'are given. serve, to more-'particularly illustrate the nature of our inven tion.

I Example 1 77 parts of Anthrene "dark blue BO (Color Index No. -109 9) double 26 parts 0 Anthrene 'ade green'(Color Inlex No. 1101; single strength, an 9.5 parts of Anthrene yellowvG (Color Index No.'1118) doublestr ength, 90 all mpaste form, are mixed together and 38 parts of diethylene glycol added thereto. This mixture is then carefully evaporated to a final weight of 100 parts. The resulting composition when employed to print on cotton in the usual manner produces a black shadeof the usual fastness of vat dyestuffs.

Example 2 The procedure followed is the same as in Example 1 except that the following proportions of the ingredients are employed 80 parts of Anthrene dark blue BO,

10 parts of Anthrene jade green,

20 parts of Anthrene yellow G, and

30 parts of diethylene glycol.

This mixture produces black prints of agreener shade than the dyestuff of Example 1.

Ewample 3 I position prints cotton in black prints of the usual fastness qualities characteristic of vat dyestuffs.

Example 4 80 parts of Anthrene dark blue BO,

20 parts of Anthrene yellow G,

50 parts'of diethylene glycol are mixed together and evaporated to a weight of 100 parts. The resulting product prints cotton in fast, black prints.

1 7 Example 5 72 parts of Anthrene dark blue BO,

12 parts of Anthrene jade green,

16 parts of Anthrene yellow AG (Color Index No. 1132) double strength, and

36 parts of diethylene glycol are mixed together and carefully evaporated to a final weight of 100 parts. This composition also produces black prints on cotton..

E wample 6 r 80 parts of Anthrene dark blue BO,

28 parts of ,Anthrene golden orange G, x

8 parts of Anthrene jade green, 40 parts of diethylene glycol v are mixed together and evaporated. to a weight of 100 parts. A composition is thus obtained which also prints ,cotton in fast, black prints.

If desired, the assisting agent may be omitted, although if this is done some of the brilliance and strength of the prints are sacrificed.

, Example 7 77 parts of Anthrene dark blue BO, 26 parts of Anthrene jade green, and

9.5 parts of Anthrene yellow G pastes.

v 5. As a new article of all inpaste form, are thoroughly mixed to? gether. This mixture may be used directly for printing fabrics and when so used produces fast, greenish black prints.

g It is of course to be understood that while the above examples particularly describe the use of the compositions in printing on cotton, if desired, they may also be used for dyeing from the vat.

It will thus be seen that We have disclosed the preparation'of the very valuable and expensive black vat colors by a simple and thickening and reducing agents, in the same I manner as when printing with other vat dyestuffs. For clearness, we shall designate hereinafter the pastes directly as produced in the" above examples as dyestufl' pastes, and after incorporation of the same with thickening and reducing agents as printing vWe claim as our invention: 1. A vat' dyestufl' for coloring fibrous bodies in black shades comprising a composite mixture of dibenzanthrone and a vat dyestuff producing on the fibre a color within the range of orange to yellow, said vat dyestufl' forming from 10 to 50% of the mixture.

2. A vat dyestuif for coloring; fibrous bodies in black shades comprising a composite mixture of Anthrene dark blue'BO and Anthrene yellow G, said yellow component forming from 10 to 50% of the mixture.

3. A dyestuff paste ,for printing cotton and other fibrous bodies in fast black shades comprising an intimate mixture of. dibenstuff forming from 10 to 50% of the dyestufl mixture.

4. A dyestufl paste for printing cotton and other fibrous materials in fast black shades comprising an intimate mixture of Anthrene dark blue BO, Anthrene yellow G and diethylene glycol, said yellow component forming from 10 to 50% of the dyestufi' mixture. i I

manufacture, fibrous material dyed with the composition of claim 1.'

6. As a new article of manufacture, a

cotton material dyed with the composition of claim2.

7. As a new article of manufacture, fibrous material printed with the composition of claim 3.

8. As a new article of manufacture, a

cotton material printed with the composition of claim 4.

In testimony whereof we have hereunto subscribed our names at Carrollville, Milwaukee County, Wisconsin.

EDWARD T. HOWELL.

ROBERT J. GOODRICH. 

